Not sure exactly what its origins are, but it's standard Indian English. It's a legitimate dialect of English, just like standard American English has its own unique idioms like "grandfathered in" (a term that has extremely racist origins).
Edit, for other's curious, as the person I'm replying to said, it's not racist per se, but has its origins in racist practice:
> The term originated in late nineteenth-century legislation and constitutional amendments passed by a number of U.S. Southern states, which created new requirements for literacy tests, payment of poll taxes, and/or residency and property restrictions to register to vote. States in some cases exempted those whose ancestors (grandfathers) had the right to vote before the American Civil War, or as of a particular date, from such requirements. The intent and effect of such rules was to prevent African-American former slaves and their descendants from voting, but without denying poor and illiterate whites the right to vote.
I often hear people use the phrase "call a spade a spade", thinking it's saying "if a card shows a spade, call it as a spade (when showing the hand)", but I've heard for a long time that phrase is also racist. Not growing up around anyone who ever used that phrase, I would have had no idea.
Makes me wonder how many other phrases out there in every day use don't have a happy meaning, even though at first glance they might seem innocuous.
The spade is question is a digging tool.
But "chink" is also an offensive term for a Chinese person, so "chink in one's armor" can be misunderstood, especially if what you are talking about actually involves a Chinese person. ESPN got in trouble a couple of times with it, even though they had used it thousands of times before without incident, because of a couple articles where the weakness they were describing on some team was a player who was Chinese.